The graph between the displacement \[x\] and time \[t\] for a particle moving in a straight line is shown in figure. During the interval \[OA,\,AB,\,BC\] and \[t=1,\ {{v}_{x}}=0\], the acceleration of the particle is [CPMT 1986]

• A. OA, AB, BC, CD + 0 + +
• B. OA, AB, BC, CD - 0 + 0
• C. OA, AB, BC, CD + 0 - +
• D. OA, AB, BC, CD - 0 - 0